The Oldest,easily Identifiable Fossils Appear in Sedimentary Rocks That Formed

question 23

Short Answer

The oldest,easily identifiable fossils appear in sedimentary rocks that formed 500 million to 600 million years ago during the ____________________ period.

---

Definitions:

Communication Disorder

A condition that affects a person's ability to comprehend, detect, or apply language and speech in a typical manner.

Hysteria

Historically referred to excessive or uncontrollable emotion or excitement, often considered a now-outdated psychological diagnosis.

Maladaptive Responses

Actions or behaviors that are counterproductive to dealing with stress or anxiety, often preventing a person from adjusting healthily to situations.

Adaptive Fear

A beneficial response to threats or danger, promoting survival by motivating avoidance or defensive behaviors.